http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Rear mech thread size en Wed, 13 May 2026 04:41:32 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108924 Sat, 27 Apr 2013 11:58:05 +0000 chdot 108924@http://citycyclingedinburgh.info/bbpress/ <p>"I always turn the screw in the opposite direction until I hear a click"</p> <p>Sound advice. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108916 Sat, 27 Apr 2013 10:49:39 +0000 Focus 108916@http://citycyclingedinburgh.info/bbpress/ <p>I've only had cause to fit a rear mech twice that I can remember, but any time I'm screwing in a tricky thread, I always turn the screw in the opposite direction until I hear a click to tell me the screw is seated correctly. It saves an awful lot of cross-threaded screws! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108910 Sat, 27 Apr 2013 10:19:14 +0000 chdot 108910@http://citycyclingedinburgh.info/bbpress/ <p><a href="http://citycyclingedinburgh.info/bbpress/topic.php?id=2052" rel="nofollow">http://citycyclingedinburgh.info/bbpress/topic.php?id=2052</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108909 Sat, 27 Apr 2013 10:07:20 +0000 wingpig 108909@http://citycyclingedinburgh.info/bbpress/ <p>I think Dalry Lidl still had some tap and die sets in stock last week from their most recent budget tool extravaganza. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108901 Sat, 27 Apr 2013 08:40:43 +0000 Smudge 108901@http://citycyclingedinburgh.info/bbpress/ <p>A tap is an engineers tool used to cut a screw thread in a blank hole, it can also be used to clean up a slightly damaged thread. Often found as part of a "tap and die" set, one lot of tools for internal threads, one for external threads. Very handy things (if you ever have the correct size to hand for the piece you are working on... sigh)</p> <p>No real reason for you to know the term unless you've had cause to use them or it's come up in general conversation. As you hang around with bikie types I'd give it a 2 out of 10 ;-) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108896 Sat, 27 Apr 2013 08:21:36 +0000 gembo 108896@http://citycyclingedinburgh.info/bbpress/ <p>Tap is DIY term I believe linked to the thread for a screw? Applies to bikes if you have a thread that needs realigned, may work on this forum too. ChDot could give the thread a Tap to get it back on topic? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108874 Fri, 26 Apr 2013 21:29:44 +0000 Uberuce 108874@http://citycyclingedinburgh.info/bbpress/ <p>Tap?</p> <p>Also, on a scale of one to ten, how much should I know that already? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108860 Fri, 26 Apr 2013 20:35:14 +0000 kaputnik 108860@http://citycyclingedinburgh.info/bbpress/ <p>All sorted thanks, running the correct sized tap through it sorted it out. The frame is carbon and aluminium composite and wrapped in a sort of plastic sheath, some of the plastic had got into the threads I think meaning the dérailleur was screwing in at an off-angle and beginning to strip the threads. No harm done. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108663 Thu, 25 Apr 2013 10:27:36 +0000 kaputnik 108663@http://citycyclingedinburgh.info/bbpress/ <p>Thanks chaps. It's a frame made from pencils, with a threaded metal insert. I stopped trying to tighten when I was getting resistance so think I've only b******d the first mm or so of threads and it should be fine once a tap of correct size has been run through it. There shouldn't be any bend in it, as it's not metal and also never had a mech in it. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108642 Thu, 25 Apr 2013 08:35:17 +0000 Cyclops 108642@http://citycyclingedinburgh.info/bbpress/ <p>All modern hangers have a 10mm x 1mm thread as have all rear mechs. Possibly a frame aged +40 years might have something different but definitely not nowadays. Is your rear mech hangar slightly bent as this can sometimes cause problems with cross-threading? If it's not an interchangeable hangar very occasionally these may need the threads chased on new frames before fitting the rear mech. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108639 Thu, 25 Apr 2013 07:45:52 +0000 Roibeard 108639@http://citycyclingedinburgh.info/bbpress/ <p>Without insult to your competency, I've found that the angle to present the derailleur to the hanger hasn't always been obvious, so getting them properly started took a few attempts.</p> <p>No doubt a proper mechanic will be along shortly with the correct answer, though!</p> <p>Robert </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10019#post-108638 Thu, 25 Apr 2013 00:47:44 +0000 kaputnik 108638@http://citycyclingedinburgh.info/bbpress/ <p>Slightly obscure topic - thread size for rear mech hangers. I've got a modern (2008 Giant) frame and a modern (2012 SRAM Rival) rear derailleur. Both should have compatible threads for the hanger, right?</p> <p>Wrong (it seems). The derailleur has begun to strip the threads on the hanger, so I've stopped trying to install it before I cause any catastrophic damage. The frame was new old stock and there's no previous damage to the threads (bike has never been assembled anyway).</p> <p>All my googling has turned up is that rear mechs should have a 10mm x 1mm thread / pitch known as "M10 superfine" in the thread industry.</p> <p>I've never had any trouble like this, derailleurs have always just "worked" when I've put them on the frame. </p>